Studies on the effect of swirl numbers on strongly swirling turbulent gas-particle flows using a phase-Doppler particle anemometer

Abstract

The effect of swirl numbers on the flow behavior of strongly swirling turbulent gas-particle flows with swirl numbers of s=0.47, 1.0, 1.5 and 2.1 in sudden-expansion and cyclone chambers is studied using a 2-D and a 3-D phase Doppler particle anemometers (PDPA). The axial and tangential time-averaged and the root mean square (RMS) fluctuation velocities of gas and particle phases and particle concentration are measured. The result shows that the swirl number has an obvious effect on the axial velocity profiles, the Rankine vortex structure of tangential velocity profiles, the relationship between two-phase velocities, the turbulence intensity level and the anisotropy of turbulence.